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N4 road (Ireland)
The N4 road is a national primary road in Ireland, running from Dublin to the northwest of Ireland and Sligo town. The M6 to Galway diverges from this route after Kinnegad, while the N5 to Westport diverges at Longford town. The section of the N4 that is motorway standard is designated the M4 motorway.
==Road standard==
The N4 originates at an intersection with the M50 motorway at Junction 7. This is also Junction 1 of the N/M4. The Liffey Valley Shopping Centre is located at junction 2. The road has three lanes and a bus lane in each direction between the M50 and start of the M4 at Leixlip.
The N4 was the only one of the main inter-urban national routes whose dual-carriageway section continued into the city centre; however, the section inside the M50 was re-classified as the R148 in 2012.〔(Roads Act 1993 (Classification of Regional Roads) Order 2012 )〕
Heading west, the PPP motorway section (see below) ends west of Kinnegad, and the motorway terminates 5 km further west; it continues as HQDC and bypasses Mullingar. From the Mullingar bypass to Edgeworthstown, the road is wide single carriageway with hard shoulders. Between Edgeworthstown and Longford, there is a lower standard single carriageway road. Between Longford and Rooskey single carriageway continues at a higher standard. Dromod and Rooskey were bypassed in late 2007. This section of road consists of 3 roundabouts and Type 2 dual carriageway, i.e.: 2 lanes in each direction and no hard shoulder. The road resumes as a single carriageway with hard shoulders until it reaches Carrick on Shannon, where it becomes a local urban road through five roundabouts, and passing over the River Shannon into County Roscommon. The road becomes high quality single carriageway bypass 3 km outside of Boyle town with periodic alternating overtaking lanes passing Lough Key Forest Park and Ballinafad until it reaches Castlebaldwin. From Castlebaldwin to the Collooney dual carriageway the road is a single narrow carriageway with intermittent hard shoulders and several dangerous bends. The road becomes near-motorway standard dual carriageway again at Collooney, approaching Sligo town.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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